CN113803900A - Low-pressure steam continuous recovery heat pump system - Google Patents
Low-pressure steam continuous recovery heat pump system Download PDFInfo
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- CN113803900A CN113803900A CN202110980066.1A CN202110980066A CN113803900A CN 113803900 A CN113803900 A CN 113803900A CN 202110980066 A CN202110980066 A CN 202110980066A CN 113803900 A CN113803900 A CN 113803900A
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- pipeline
- evaporator
- standby
- heat exchange
- refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention belongs to the technical field of waste heat utilization, and particularly relates to a low-pressure steam continuous recovery heat pump system. The technical scheme is as follows: a low-pressure steam continuous recovery heat pump system comprises a steam inlet pipeline, wherein the steam inlet pipeline is connected with a plurality of heat exchange pipelines, the other end of each heat exchange pipeline is connected with an evaporator, the other end of each evaporator is connected with a condenser through a refrigerant pipeline, and the other end of each condenser is connected with an output pipeline; the steam inlet pipeline is also connected with a standby heat exchange pipeline, the other end of the standby heat exchange pipeline is connected with a standby evaporator, and the standby evaporator is respectively connected with a plurality of refrigerant pipelines through standby refrigerant pipelines; the washing pipeline is respectively connected with the plurality of heat exchange pipelines and the standby heat exchange pipeline. The invention provides a low-pressure steam continuous recovery heat pump system which can clean and maintain a heat exchanger under the condition of not influencing continuous operation.
Description
Technical Field
The invention belongs to the technical field of waste heat utilization, and particularly relates to a low-pressure steam continuous recovery heat pump system.
Background
The double-effect concentration heating process is a common process in the chemical field, generally, secondary steam is absorbed by an atmospheric condenser, negative pressure is established after the atmospheric condenser absorbs the secondary steam, so that the secondary steam in the secondary effect is continuously pumped out, meanwhile, after the cold water in the atmospheric condenser absorbs the secondary steam, the water temperature rises, and the secondary steam is cooled by measures such as air cooling and then returns to the atmospheric condenser. The whole process causes a great deal of waste of energy.
Aiming at the situation, the heat pump technology is adopted to condense the secondary steam, so that the secondary steam can be extracted from the secondary effect, and meanwhile, the heat of the secondary steam can be utilized to generate high-grade steam or hot water, and the energy can be saved to the maximum extent.
Based on the above thought, there are several patents in the right state, specifically as follows: a double-stage compression heat pump circulating system (201811543463.7) for deeply condensing exhausted steam is disclosed, which features that the sensible heat and latent heat of secondary steam are used in different stages for higher performance coefficient of heat pump. A double-effect evaporation and concentration system (201811544907.9) of a double-stage compression heat pump mainly solves the problem of improving the energy efficiency of the system, and a vacuum pump is arranged at the tail of an evaporator to ensure the vacuum degree of the system.
However, in the above two systems, the secondary steam entering from the pipeline has a relatively high corrosivity and contains liquid foam, once the secondary gas corrodes the evaporator or the liquid foam condenses and deposits on the heat exchange pipe, corrosion, scaling or blockage of the heat exchange pipeline can be caused, the heat exchange performance of the system is reduced, the heat pump system cannot normally operate, and finally the system is shut down. Both of the above systems do not allow for periodic or emergency cleaning and maintenance of the evaporator without affecting the continuous operation of the system.
Disclosure of Invention
In order to solve the above problems in the prior art, an object of the present invention is to provide a low-pressure steam continuous recovery heat pump system that can clean and maintain a heat exchanger without affecting continuous operation.
The technical scheme adopted by the invention is as follows:
a low-pressure steam continuous recovery heat pump system comprises a steam inlet pipeline, wherein the steam inlet pipeline is connected with a plurality of heat exchange pipelines, the other end of each heat exchange pipeline is connected with an evaporator, the other end of each evaporator is connected with a condenser through a refrigerant pipeline, and the other end of each condenser is connected with an output pipeline; the steam inlet pipeline is also connected with a standby heat exchange pipeline, the other end of the standby heat exchange pipeline is connected with a standby evaporator, and the standby evaporator is respectively connected with a plurality of refrigerant pipelines through standby refrigerant pipelines; the washing pipeline is respectively connected with the plurality of heat exchange pipelines and the standby heat exchange pipeline.
The secondary steam (80 ℃) enters from a steam inlet pipeline, is divided into a plurality of paths, enters each evaporator from a plurality of heat exchange pipelines respectively, flows out after condensation, converges into a discharge pipeline, and enters the next process flow. The refrigerant circulates between refrigerant pipelines between the evaporator and the condenser, heat is transferred to the condenser, and the condenser uses the heat for preparing fresh steam or hot water.
The system is additionally provided with a set of standby evaporator and a standby heat exchange pipeline. When a certain evaporator is cleaned or maintained, the standby evaporator is replaced by the evaporator, the standby evaporator is communicated with the steam inlet pipeline, and then the standby evaporator is in operation. At this time, high-pressure water enters the evaporator from the flushing pipeline to flush out solid particles or corrosive substances attached to the inside of the evaporator. The evaporator can be flushed by the flushing pipeline, and the standby evaporator is in operation, so that the system can clean and maintain the heat exchanger under the condition of not influencing continuous operation.
The invention also comprises a discharge pipeline which is respectively connected with the plurality of evaporators and the standby evaporator. After the steam is subjected to heat exchange through the evaporator or the standby steam valve, condensed water is discharged from the discharge pipeline and enters the next process flow. When the evaporator is flushed, sewage carrying solid particles or corrosive substances also flows out of the discharge line.
In a preferred embodiment of the present invention, a compressor is installed in a refrigerant line in which the refrigerant flows from the evaporator to the condenser. The compressor continuously absorbs heat from one end of the evaporator into the refrigerant and then sends the refrigerant to the condenser, so that fresh steam or hot water can be prepared from the other end of the condenser.
In a preferred embodiment of the present invention, a pressure reducing valve is installed on a refrigerant line in a direction in which the refrigerant flows from the condenser to the evaporator.
As a preferred scheme of the invention, valves are arranged on the heat exchange pipeline, the standby heat exchange pipeline, the pipeline between the flushing pipeline and the heat exchange pipeline and the pipeline between the flushing pipeline and the standby heat exchange pipeline. When the evaporator needs to be cleaned or maintained, the valves on the heat exchange pipeline and the standby heat exchange pipeline are switched, the valve on the pipeline between the flushing pipeline and the heat exchange pipeline is opened, the flushing pipeline can flush the evaporator, and the standby evaporator is in operation, so that the heat exchanger is guaranteed to be cleaned and maintained under the condition that continuous operation is not influenced.
As a preferable scheme of the invention, valves are arranged on the steam inlet pipeline and the flushing pipeline.
As a preferable mode of the present invention, valves are installed on a refrigerant pipeline in which the refrigerant flows from the evaporator to the condenser, a refrigerant pipeline in which the refrigerant flows from the condenser to the evaporator, a backup refrigerant pipeline in which the refrigerant flows from the backup evaporator to the condenser, and a backup refrigerant pipeline in which the refrigerant flows from the condenser to the backup evaporator. When a certain evaporator is cleaned or maintained, the standby evaporator is required to be connected with the condenser, a refrigerant pipeline in the direction that a refrigerant flows from the evaporator to the condenser is closed, a valve on the refrigerant pipeline in the direction that the refrigerant flows from the condenser to the evaporator is closed, a standby refrigerant pipeline in the direction that the refrigerant flows from the standby evaporator to the condenser is opened, and a valve on the standby refrigerant pipeline in the direction that the refrigerant flows from the condenser to the standby evaporator is opened, so that the standby evaporator replaces the certain evaporator to work.
As a preferable scheme of the invention, the number of the heat exchange pipelines, the number of the evaporators and the number of the condensers are two.
The invention has the beneficial effects that:
the invention is additionally provided with a set of standby evaporator and standby heat exchange pipeline. When a certain evaporator is cleaned or maintained, the standby evaporator is replaced by the evaporator, the standby evaporator is communicated with the steam inlet pipeline, and then the standby evaporator is in operation. At this time, high-pressure water enters the evaporator from the flushing pipeline to flush out solid particles or corrosive substances attached to the inside of the evaporator. The evaporator can be flushed by the flushing pipeline, and the standby evaporator is in operation, so that the system can clean and maintain the heat exchanger under the condition of not influencing continuous operation.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure, 1-steam inlet line; 2-heat exchange lines; 3-refrigerant pipeline; 4-spare heat exchange pipeline; 5-spare refrigerant pipeline; 6-flushing the pipeline; 7-a discharge line; 21-an evaporator; 31-a condenser; 32-a compressor; 33-a pressure relief valve; 41-spare evaporator; a 1-first valve; a 2-second valve; a 3-third valve; a 4-fourth valve; a 5-fifth valve; a 6-sixth valve; a 7-seventh valve; a 8-eighth valve; a 9-ninth valve; a 10-tenth valve; a 11-eleventh valve; a 12-twelfth valve; a 13-thirteenth valve; a 14-fourteenth valve; a 15-fifteenth valve; a 16-sixteenth valve.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1, the low-pressure steam continuous recovery heat pump system of the present embodiment is mainly composed of an evaporator 21, a compressor 32, a condenser 31, a pressure reducing valve 33, a control unit, and the like. The whole heat pump system consists of two sets of heat pump units, wherein the evaporator 21, the compressor 32, the condenser 31, the pressure reducing valve 33 and the control system on one branch form one set of heat pump unit. The two-effect secondary steam (80 ℃) enters from a steam inlet pipeline 1, is divided into two paths and respectively enters the evaporators 21 of the two sets of heat pump units from the two heat exchange pipelines 2, flows out from the pipelines after being condensed, and then enters the next process flow after converging into a discharge pipeline 7. In the system, secondary steam entering from the steam inlet pipeline 1 has high corrosivity and contains liquid foam, once the secondary gas corrodes the evaporator 21 or the liquid foam is condensed and precipitated on the heat exchange pipe, the heat exchange pipeline 2 is corroded, scales or blocked, the heat exchange performance of the system is reduced, the heat pump system cannot normally operate, and finally the system is shut down.
In order to clean and maintain the evaporator 21 without stopping the equipment, a set of standby evaporator 41 is additionally arranged, a flushing pipeline 6 is additionally arranged, and ball valves or remote control valves are additionally arranged at each inlet, outlet and branch. The method comprises the following specific steps:
when the system is operating normally, the heat exchanger is periodically (for a short time, for example, half a month) washed and maintained, and taking one of the evaporators 21 as an example, the backup evaporator 41 is switched on when the evaporator 21 is cleaned. Specifically, the second valve a2, the ninth valve a9, and the eleventh valve a11 are opened to connect the backup heat exchange line 4 on the secondary steam side of the backup evaporator 41 and the backup refrigerant line 5. At the same time, the third valve a3, the thirteenth valve a13 and the fourteenth valve a14 are closed, so that the heat exchange pipeline 2 on the secondary steam side of the evaporator 21 is closed, the refrigerant pipeline 3 connected with the evaporator 21 is closed, and the evaporator 21 is in a withdrawing state. In this case, the heat pump unit of this route is composed of the backup evaporator 41, the compressor 32, the condenser 31, the pressure reducing valve 33, and the control system. Then, the fifth valve a5 and the seventh valve a7 are opened, and the high-pressure water enters the heat exchange pipeline 2 from the flushing pipeline 6, flushes the evaporator 21, flushes the solid particles or corrosive substances attached to the inside of the evaporator, flows out of the pipeline, and further flows out of the discharge pipeline 7. After the cleaning is completed, the fifth valve a5 and the seventh valve a7 are closed, so that the flushing system is closed. The cleaned evaporator 21 can be connected to a heat pump unit in the same manner, and the other evaporator 21 can be replaced for cleaning.
The evaporator 21 is periodically (for a long time, such as half a year or one year) disassembled and mechanically cleaned, the operation flow is the same as that of the method, the heat exchanger is required to be of a detachable structure, and the surface deposits of the heat exchange tube can be mechanically cleaned after the heat exchanger is disassembled.
The circulation is repeated, and each evaporator 21 and the backup evaporator 41 can be recycled. If the cooler is damaged, the damaged cooler can be isolated by the method for replacement.
This can also be done if the system detects a decrease in heat exchange performance of the evaporator 21.
In addition, if the secondary steam entering the pipeline 1 fluctuates, such as the flow rate increases, and the heat exchange area of the evaporator 21 of the heat pump system is not enough, the secondary steam can be equally distributed to the two evaporators 21 and the backup evaporator 41 by adjusting the second valve a2, the third valve a3 and the fourth valve a4, and the refrigerant can be equally distributed in the loop of the compressor 32 by adjusting the valves of the refrigerant loop.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (8)
1. The low-pressure steam continuous recovery heat pump system is characterized by comprising a steam inlet pipeline (1), wherein the steam inlet pipeline (1) is connected with a plurality of heat exchange pipelines (2), the other ends of the heat exchange pipelines (2) are connected with an evaporator (21), the other end of the evaporator (21) is connected with a condenser (31) through a refrigerant pipeline (3), and the other end of the condenser (31) is connected with an output pipeline; the steam inlet pipeline (1) is also connected with a standby heat exchange pipeline (4), the other end of the standby heat exchange pipeline (4) is connected with a standby evaporator (41), and the standby evaporator (41) is respectively connected with the plurality of refrigerant pipelines (3) through standby refrigerant pipelines (5); the device also comprises a flushing pipeline (6), wherein the flushing pipeline (6) is respectively connected with the plurality of heat exchange pipelines (2) and the standby heat exchange pipeline (4).
2. A low pressure steam continuous recovery heat pump system according to claim 1, further comprising a discharge line (7), the discharge line (7) being connected to the plurality of evaporators (21) and the backup evaporator (41), respectively.
3. A low pressure vapor continuous recovery heat pump system as claimed in claim 1, wherein a compressor (32) is installed on the refrigerant line (3) in the direction of the refrigerant flowing from the evaporator (21) to the condenser (31).
4. The system as claimed in claim 1, wherein a pressure reducing valve (33) is installed on the refrigerant pipeline (3) in the direction from the condenser (31) to the evaporator (21).
5. The low-pressure steam continuous recovery heat pump system according to claim 1, wherein valves are installed on the heat exchange pipeline (2), the backup heat exchange pipeline (4), the pipeline between the flushing pipeline (6) and the heat exchange pipeline (2), and the pipeline between the flushing pipeline (6) and the backup heat exchange pipeline (4).
6. A low pressure steam continuous recovery heat pump system according to claim 1, characterized in that valves are installed on both the steam inlet line (1) and the flushing line (6).
7. The low-pressure steam continuous recovery heat pump system according to claim 1, wherein valves are installed on a refrigerant pipeline (3) for the refrigerant flowing from the evaporator (21) to the condenser (31), a refrigerant pipeline (3) for the refrigerant flowing from the condenser (31) to the evaporator (21), a standby refrigerant pipeline (5) for the refrigerant flowing from the standby evaporator (41) to the condenser (31), and a standby refrigerant pipeline (5) for the refrigerant flowing from the condenser (31) to the standby evaporator (41).
8. The low-pressure steam continuous recovery heat pump system according to any one of claims 1 to 7, wherein the number of the heat exchange pipeline (2), the number of the evaporator (21) and the number of the condenser (31) are two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110980066.1A CN113803900A (en) | 2021-08-25 | 2021-08-25 | Low-pressure steam continuous recovery heat pump system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110980066.1A CN113803900A (en) | 2021-08-25 | 2021-08-25 | Low-pressure steam continuous recovery heat pump system |
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| CN113803900A true CN113803900A (en) | 2021-12-17 |
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| CN202110980066.1A Pending CN113803900A (en) | 2021-08-25 | 2021-08-25 | Low-pressure steam continuous recovery heat pump system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114623429A (en) * | 2022-03-22 | 2022-06-14 | 东方电气集团东方电机有限公司 | Micro-pressure steam recovery system and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017081782A1 (en) * | 2015-11-11 | 2017-05-18 | 富士電機株式会社 | Exhaust heat recovery heat pump device |
| CN107647446A (en) * | 2017-09-26 | 2018-02-02 | 南昌航空大学 | A kind of fruits and vegetables low-pressure superheated steam dries exhaust steam residual heat two-stage heat pump retracting device and method |
| CN209237373U (en) * | 2018-12-17 | 2019-08-13 | 上海新奥新能源技术有限公司 | A kind of preheating type heat pump double-effect evaporation concentration systems |
| CN111578354A (en) * | 2020-06-17 | 2020-08-25 | 卡林热泵技术有限公司 | Heating system of mining parallel compression type step ventilation air methane heat pump |
| CN111928314A (en) * | 2020-08-19 | 2020-11-13 | 哈尔滨隆通环保科技有限责任公司 | Cold region sewage waste heat recovery system of recycling |
-
2021
- 2021-08-25 CN CN202110980066.1A patent/CN113803900A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017081782A1 (en) * | 2015-11-11 | 2017-05-18 | 富士電機株式会社 | Exhaust heat recovery heat pump device |
| CN107647446A (en) * | 2017-09-26 | 2018-02-02 | 南昌航空大学 | A kind of fruits and vegetables low-pressure superheated steam dries exhaust steam residual heat two-stage heat pump retracting device and method |
| CN209237373U (en) * | 2018-12-17 | 2019-08-13 | 上海新奥新能源技术有限公司 | A kind of preheating type heat pump double-effect evaporation concentration systems |
| CN111578354A (en) * | 2020-06-17 | 2020-08-25 | 卡林热泵技术有限公司 | Heating system of mining parallel compression type step ventilation air methane heat pump |
| CN111928314A (en) * | 2020-08-19 | 2020-11-13 | 哈尔滨隆通环保科技有限责任公司 | Cold region sewage waste heat recovery system of recycling |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114623429A (en) * | 2022-03-22 | 2022-06-14 | 东方电气集团东方电机有限公司 | Micro-pressure steam recovery system and method |
| CN114623429B (en) * | 2022-03-22 | 2023-06-16 | 东方电气集团东方电机有限公司 | Micropressure steam recovery system and method |
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